Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5e47291215549a905228a5e2f3c0cfc0d07bb89453583f897e5378f6de1dee1' 
  AND token = '5f6VkC8rYx+PEH8rCKcndIbjtSn4fl84h9CqC1qPZB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}